6311989 has 2 divisors, whose sum is σ = 6311990. Its totient is φ = 6311988.

The previous prime is 6311983. The next prime is 6312017. The reversal of 6311989 is 9891136.

6311989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3179089 + 3132900 = 1783^2 + 1770^2 .

It is a cyclic number.

It is not a de Polignac number, because 6311989 - 2⁵ = 6311957 is a prime.

It is a super-2 number, since 2×6311989² = 79682410272242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6311983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3155994 + 3155995.

It is an arithmetic number, because the mean of its divisors is an integer number (3155995).

Almost surely, 2^6311989 is an apocalyptic number.

It is an amenable number.

6311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6311989 is an equidigital number, since it uses as much as digits as its factorization.

6311989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 6311989 is about 2512.3672104213. The cubic root of 6311989 is about 184.8085577423.

The spelling of 6311989 in words is "six million, three hundred eleven thousand, nine hundred eighty-nine".